I posted this on hackint0sh, but will also post it here because it seems like a lot more people are expressing trouble.
Here is what I did to make it work on 1.1.3 (it may or may not work for you):
1. If your APN (wap.voicestream.com) is not sticking, go to Settings > General > Reset >
Reset Network Settings.
2. SSH/SFTP into the phone and make sure your
proxy.pac is at
/private/var/root/.
3. The preferences file to edit has moved to
/private/var/preferences/SystemConfiguration/preferences.plist. Under the area of this file that contains:
Code:
<key>Interface</key>
<dict>
<key>DeviceName</key>
<string>ip1</string>
<key>Hardware</key>
<string>com.apple.CommCenter</string>
<key>Type</key>
<string>com.apple.CommCenter</string>
</dict>
Add:
Code:
<key>Proxies</key>
<dict>
<key>ProxyAutoConfigEnable</key>
<integer>1</integer>
<key>ProxyAutoConfigURLString</key>
<string>file:///private/var/root/proxy.pac</string>
</dict>
Hopefully others have success with this as well. Good luck!